SLVSC55C August 2013 – November 2021 TPS62090-Q1
The FREQ pin is a digital logic input which sets the nominal switching frequency. Pulling this pin to GND sets the nominal switching frequency to 2.8 MHz and pulling this pin high sets the nominal switching frequency to
1.4 MHz. Because this pin changes the switching frequency, it also changes the on-time during PFM mode. At 1.4 MHz the on-time is twice the on-time as operating at 2.8 MHz. This pin has an active pulldown resistor of typically 400 kΩ. For applications where efficiency is of highest importance, a lower switching frequency should be selected. A higher switching frequency allows the use of smaller external components, faster load transient response, and lower output voltage ripple when using same L-C values.